Follow Colin MacLeod, a timeless Scottish Highlander, on a journey accompanied by the witty spirit Amergan. Their quest leads them to the immortal tyrant Marcus Octavius, the perpetrator of Colin's beloved's ancient slaying on the Celtic lands. In the sunken ruins of New York, a single towering stronghold looms above the waves—the stronghold of Marcus Octavius. Faced with a heart-wrenching choice between aiding the remaining New Yorkers and pursuing his archenemy, MacLeod stands at a crossroads of duty and vengeance.